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is a significant concern for physicians. Central
; C9 E) H& A G) Jprecocious puberty (CPP), which is mediated
) z9 F. s" s1 D) F3 ythrough the hypothalamic pituitary gonadal axis, has1 l, [8 ]3 a+ k- T% y, {( A0 H
a higher incidence of organic central nervous system
: X$ R" p/ O9 S& h# B* A6 Nlesions in boys.1,2 Virilization in boys, as manifested
5 s* H0 P% Z% O6 }+ U" i% xby enlargement of the penis, development of pubic \# I* y; l& z1 U1 r# y
hair, and facial acne without enlargement of testi-8 ^, O- Y/ f" x! R% u$ Z7 e: K# y/ f
cles, suggests peripheral or pseudopuberty.1-3 We& }1 @4 A) d' J, V7 M
report a 16-month-old boy who presented with the
0 W5 K: o# [) n. y. R2 h& P U5 L$ G: fenlargement of the phallus and pubic hair develop-" [1 X6 `* y) [# N
ment without testicular enlargement, which was due
2 e! u* a# [* {' Sto the unintentional exposure to androgen gel used by4 q# `# w' R+ P Q( Z( i
the father. The family initially concealed this infor-7 d) K5 A2 j, Z; R, g9 n2 U
mation, resulting in an extensive work-up for this
# q' ~. i# i0 E3 e; ~child. Given the widespread and easy availability of
2 t0 `1 [' C- e2 M. Ttestosterone gel and cream, we believe this is proba-
; N- h- D% w0 v$ c; Nbly more common than the rare case report in the
% ]0 J3 B4 Z) e# nliterature.4! Q% ~. }5 l2 J @6 i) B7 |
Patient Report
3 z3 p7 W; r! B: |2 jA 16-month-old white child was referred to the9 }! M0 m* l9 j
endocrine clinic by his pediatrician with the concern9 H8 D4 o5 z( x7 S4 h- l; r; y
of early sexual development. His mother noticed
$ Y! q+ J, k, Nlight colored pubic hair development when he was
3 h" s0 M3 d3 ?0 t0 [+ B. \ ZFrom the 1Division of Pediatric Endocrinology, 2University of! Z. K! O$ q- t, g
South Alabama Medical Center, Mobile, Alabama./ F9 I1 a" \1 x b
Address correspondence to: Samar K. Bhowmick, MD, FACE,' w) a+ t/ O. y5 T$ d; l# [% M2 x
Professor of Pediatrics, University of South Alabama, College of8 C: D! p/ W: k4 A; S5 b
Medicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;
7 q, ^; I0 a: i; H" ?7 f) He-mail: [email protected].
: p* w, G+ K! X2 B7 b3 ^about 6 to 7 months old, which progressively became1 u, U* z( y! H# u/ l
darker. She was also concerned about the enlarge-$ U+ x- D0 l6 q" _" i. a
ment of his penis and frequent erections. The child/ C# Y1 J) _1 g8 z2 a5 _! s
was the product of a full-term normal delivery, with$ s( q& i; x9 e5 q3 [ F* A; k
a birth weight of 7 lb 14 oz, and birth length of2 p8 q; W0 m2 y
20 inches. He was breast-fed throughout the first year% Z ?% g" @" `
of life and was still receiving breast milk along with
# ^3 E: w/ x8 B4 u+ @) k Tsolid food. He had no hospitalizations or surgery,
) _% q- R( Q- d6 Uand his psychosocial and psychomotor development& Y1 `7 [1 t6 ~& k8 ~
was age appropriate.! O" s* g% p+ L+ N0 t
The family history was remarkable for the father,( V' U7 d4 ] B7 V/ X; B! h
who was diagnosed with hypothyroidism at age 16,- _1 Y* ^+ l6 Q; @* [$ {2 z
which was treated with thyroxine. The father’s# X* U Y( w4 P: E
height was 6 feet, and he went through a somewhat6 M1 \. ?5 ^* Z9 s! F% G5 I% A# d* O
early puberty and had stopped growing by age 14.
- Y( s4 j) }$ @- YThe father denied taking any other medication. The
" w. n; V9 J. v$ G. p% W/ m! k0 nchild’s mother was in good health. Her menarche+ Z' u2 ~9 C" ^0 D8 `* e, M1 d
was at 11 years of age, and her height was at 5 feet9 p _3 Y( G* r @
5 inches. There was no other family history of pre-
6 M) L* M* n! g4 j S9 {! C3 mcocious sexual development in the first-degree rela-
" B' k D9 p6 t4 G, g# Otives. There were no siblings.$ N. i* w: @; [7 H$ |
Physical Examination
7 Y2 U) X" Q/ ^. h9 R! k9 O' x1 KThe physical examination revealed a very active,, _) `! g% _- w" f
playful, and healthy boy. The vital signs documented
- @' p7 K2 Y; r* }% U7 Ya blood pressure of 85/50 mm Hg, his length was" F: A8 M* p1 I0 Q
90 cm (>97th percentile), and his weight was 14.4 kg: u! h7 e1 c0 J- Q3 X
(also >97th percentile). The observed yearly growth
- [1 F/ z% O7 P( c+ x" ]% Kvelocity was 30 cm (12 inches). The examination of6 [) I. u# M2 v' m- C
the neck revealed no thyroid enlargement.
5 I ?! }+ b9 e5 t/ Y A) N0 |1 lThe genitourinary examination was remarkable for+ d" S3 ? G4 `/ q
enlargement of the penis, with a stretched length of
4 _! M2 ^- d& a. X* @8 x5 x8 cm and a width of 2 cm. The glans penis was very well
' u2 p: S# r' N+ L" j! e6 q2 Bdeveloped. The pubic hair was Tanner II, mostly around; E* Y' g" v6 B) }0 r7 n" k
540/ A# I5 y! g7 |, e" C/ H
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from4 [ M1 C' q5 ~( y1 Y1 r Z
the base of the phallus and was dark and curled. The
`! ]) |6 ~3 M( }& \5 [+ v0 xtesticular volume was prepubertal at 2 mL each.! j& ~' M( ]1 g$ _
The skin was moist and smooth and somewhat
( w5 A l! X6 M: Noily. No axillary hair was noted. There were no2 x6 ?4 j) \1 ]1 Y# i
abnormal skin pigmentations or café-au-lait spots. d: @8 d- w: s0 g
Neurologic evaluation showed deep tendon reflex 2+
3 m8 A9 T/ v& n5 [2 d. ~9 H% G3 lbilateral and symmetrical. There was no suggestion8 t: o2 T- X) m( x6 c; F; L+ Y
of papilledema.
. R. r& Y3 r0 K7 \Laboratory Evaluation$ J! [9 V. g4 r
The bone age was consistent with 28 months by
4 N: K( v3 I2 uusing the standard of Greulich and Pyle at a chrono-6 F1 R( r1 y) |' A
logic age of 16 months (advanced).5 Chromosomal" c( i+ q6 Y; l
karyotype was 46XY. The thyroid function test4 A3 L6 S1 A0 A
showed a free T4 of 1.69 ng/dL, and thyroid stimu-
$ U3 S$ ?9 c& N, j& E$ t, Vlating hormone level was 1.3 µIU/mL (both normal).
4 J2 \/ Y3 B' u, z) V6 ^# E" ^0 iThe concentrations of serum electrolytes, blood$ g0 S- S' P7 @
urea nitrogen, creatinine, and calcium all were
- ?4 D. ^3 U7 Dwithin normal range for his age. The concentration% P8 c0 d* I: o" z+ f5 A! Z
of serum 17-hydroxyprogesterone was 16 ng/dL3 E: R+ _/ \( r# q4 o
(normal, 3 to 90 ng/dL), androstenedione was 204 I5 t' R/ B8 \! n$ x4 }! w
ng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-
$ G3 w% t. _% xterone was 38 ng/dL (normal, 50 to 760 ng/dL),/ w( i: G) k2 R: D4 Y3 v
desoxycorticosterone was 4.3 ng/dL (normal, 7 to' C4 I e; m8 n3 b! G
49ng/dL), 11-desoxycortisol (specific compound S)
7 h, @$ ~! m9 }: P: W6 iwas 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-! p* D# x. f: w4 E1 `
tisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total" H7 P/ ^4 e1 b: [9 p. `! ?
testosterone was 60 ng/dL (normal <3 to 10 ng/dL),% L0 X9 ~2 e3 i- ?$ n
and β-human chorionic gonadotropin was less than
% L; |5 N9 ^0 j" B; c- C) i5 mIU/mL (normal <5 mIU/mL). Serum follicular% W3 ~) J9 w: D! j- s* h. s
stimulating hormone and leuteinizing hormone
( r; a" Z7 N1 o* {9 p3 Pconcentrations were less than 0.05 mIU/mL* ?) }, H* a2 n3 H* O1 E
(prepubertal).
# b! u$ G! B/ t: ~' [1 N) `$ kThe parents were notified about the laboratory8 J3 u3 e, k$ f9 o& _# N2 ~+ `
results and were informed that all of the tests were0 p0 [2 ]0 h1 b- D% B% L: A* u/ {
normal except the testosterone level was high. The
% t# }) `! q/ D5 S) z( H) Zfollow-up visit was arranged within a few weeks to7 l2 H8 {5 ~, _, ~& }/ t- H0 Y
obtain testicular and abdominal sonograms; how-
; w+ Q& H- ?* m0 fever, the family did not return for 4 months.$ ^0 V" _% k7 }' L, x
Physical examination at this time revealed that the
" _1 E; }6 g; v1 @9 d0 ychild had grown 2.5 cm in 4 months and had gained9 A' [* W `; s1 `/ r6 N4 T
2 kg of weight. Physical examination remained
# o" \) ?0 X. v8 Y6 W/ vunchanged. Surprisingly, the pubic hair almost com-
+ I1 e7 g/ ^5 ~$ f8 qpletely disappeared except for a few vellous hairs at
& H# L$ x* v k+ S4 V/ f, l" p! V1 jthe base of the phallus. Testicular volume was still 2
' Z8 Y4 C& Q: ]9 `* O% C, [mL, and the size of the penis remained unchanged.# f/ O. P. T6 @6 D
The mother also said that the boy was no longer hav-
$ ?3 `7 f) { N) ying frequent erections.! Z; ], `. K. d7 [
Both parents were again questioned about use of
& B' l2 x6 o$ @, ~3 A! ]& _; Xany ointment/creams that they may have applied to+ r2 H$ S/ v" `
the child’s skin. This time the father admitted the7 v; V) K i6 f9 v* d$ {8 v
Topical Testosterone Exposure / Bhowmick et al 541 I5 W. l# h7 l" `
use of testosterone gel twice daily that he was apply-& P6 ]4 {4 @5 `! I0 E7 ~6 F
ing over his own shoulders, chest, and back area for
/ _4 a7 h/ Y a% p. e% b+ Aa year. The father also revealed he was embarrassed. Q2 |+ J; C) |
to disclose that he was using a testosterone gel pre-9 o d1 L. E/ L7 t
scribed by his family physician for decreased libido5 z1 E( x; \7 F6 }
secondary to depression.
! N. Q9 s9 [! r+ V# y! ~% ?The child slept in the same bed with parents.
& \6 k4 M7 N8 v) TThe father would hug the baby and hold him on his
: x( {6 I+ J$ Tchest for a considerable period of time, causing sig-$ @ G0 g1 g* U0 J# k/ V
nificant bare skin contact between baby and father.
+ @+ L( e8 f! J2 D) J# sThe father also admitted that after the phone call,
8 g9 A7 c( X/ }when he learned the testosterone level in the baby
* ?. l2 a7 |9 b0 {! [! Fwas high, he then read the product information
, f* F/ A" S+ D qpacket and concluded that it was most likely the rea-
( w) @; ?; S2 r$ Oson for the child’s virilization. At that time, they
( T/ v' _" |- e9 v P- vdecided to put the baby in a separate bed, and the
" l) P+ o8 ]% H/ Bfather was not hugging him with bare skin and had
4 o' d8 D% T& ibeen using protective clothing. A repeat testosterone1 E5 F7 C0 B, X+ z2 Y
test was ordered, but the family did not go to the1 ]/ u; l; g, f/ H1 u8 I. ]
laboratory to obtain the test.
6 d) Q3 j6 V( K6 A8 T$ v% CDiscussion( _/ w8 T3 Y8 t. W4 {
Precocious puberty in boys is defined as secondary+ @2 T# n. X2 Y2 s' o, }9 F
sexual development before 9 years of age.1,4# V- ~# ]- }$ p! G- C- D! A) c3 _
Precocious puberty is termed as central (true) when
$ ?: p- P7 O) w" e4 tit is caused by the premature activation of hypo-9 ?: k e5 g5 _# U/ ?
thalamic pituitary gonadal axis. CPP is more com-! k4 n, U; h4 f
mon in girls than in boys.1,3 Most boys with CPP
& F# i+ o a( F1 q; Ymay have a central nervous system lesion that is9 |; j: i) ]% D) q k2 X6 l
responsible for the early activation of the hypothal-
( [8 f$ j% p2 k9 f0 b3 kamic pituitary gonadal axis.1-3 Thus, greater empha-
2 n" ^3 c5 }9 J" d# y/ Esis has been given to neuroradiologic imaging in, N$ B. f q" T* n
boys with precocious puberty. In addition to viril-
m( V$ t0 Q0 f0 B3 _ization, the clinical hallmark of CPP is the symmet-
- Q0 W: k% f; f- A4 w$ [# Krical testicular growth secondary to stimulation by
8 z+ x7 u) s4 t/ I/ |3 }: u) Sgonadotropins.1,3
, b' z% `; R5 zGonadotropin-independent peripheral preco-
- I4 K9 ~; K& v' H, C( ]" Qcious puberty in boys also results from inappropriate+ x, j+ w# }2 k1 P
androgenic stimulation from either endogenous or3 ~$ Y1 I) Z/ y% B/ V, X9 ~
exogenous sources, nonpituitary gonadotropin stim- Q0 e- m7 G6 H( R& \/ p
ulation, and rare activating mutations.3 Virilizing
; q* j4 s. {; J& ^congenital adrenal hyperplasia producing excessive
; g! k7 b) U% N% @) z4 n {adrenal androgens is a common cause of precocious
9 a: u' Q# J) ]$ @. gpuberty in boys.3,4
/ d. }8 v e- |. V6 W+ `The most common form of congenital adrenal
5 V" f W! p+ B& W" M9 uhyperplasia is the 21-hydroxylase enzyme deficiency.
7 b! `) M6 x# m* b7 c7 L+ G% P( \The 11-β hydroxylase deficiency may also result in! n, W8 ]5 |& d+ r; y% @
excessive adrenal androgen production, and rarely,
: w. |8 ^; M0 F: [an adrenal tumor may also cause adrenal androgen
. r, U' K0 }5 }* ^excess.1,30 E6 Q8 f5 i) N8 z' y) w
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
8 u% O9 Y$ q( Q1 x# G7 z; B542 Clinical Pediatrics / Vol. 46, No. 6, July 2007* V( P6 N4 C! C$ i$ K9 h5 W
A unique entity of male-limited gonadotropin-
4 s) e5 ^$ P5 x5 V# A7 Gindependent precocious puberty, which is also known' }/ E* Q/ c! m/ L4 }
as testotoxicosis, may cause precocious puberty at a# Y/ g7 u, ^, x' p7 }- l' X
very young age. The physical findings in these boys
' _+ H% v' H5 c- xwith this disorder are full pubertal development,
8 ]2 |! o" E8 H6 f$ Kincluding bilateral testicular growth, similar to boys- a5 C; @, v. J% `+ P( |6 O/ w
with CPP. The gonadotropin levels in this disorder* o9 x. H5 @9 n, T( _, G$ E7 j3 d! f
are suppressed to prepubertal levels and do not show
; z2 x% o% @' }, F$ R# xpubertal response of gonadotropin after gonadotropin-) w, @# [: J1 }8 r8 ~
releasing hormone stimulation. This is a sex-linked
# b% o7 z; S4 s( X! g3 e2 hautosomal dominant disorder that affects only
7 `4 M: P' n# O. N! I! K9 b* ~- cmales; therefore, other male members of the family
0 J _% X8 C! S2 M6 Mmay have similar precocious puberty.3
% M1 L4 x2 I5 P5 DIn our patient, physical examination was incon-
# e1 Z4 F' r8 V$ j* Csistent with true precocious puberty since his testi-
, K6 J9 s* W- G& j4 Acles were prepubertal in size. However, testotoxicosis# X& z- E. R0 z+ x* Y+ P0 h( D
was in the differential diagnosis because his father
+ `. [" S. S! t* K3 u/ ~% estarted puberty somewhat early, and occasionally, u+ a& ^2 {/ a. V
testicular enlargement is not that evident in the9 d* Y. ?/ n7 W) t- e
beginning of this process.1 In the absence of a neg-
7 A7 y, |% w& B0 h8 P1 A. C8 |/ ~ative initial history of androgen exposure, our
% ~( v2 O5 S' `$ |- g$ |! P; Zbiggest concern was virilizing adrenal hyperplasia,+ r7 Y; ]6 s" K
either 21-hydroxylase deficiency or 11-β hydroxylase
2 |1 P* @4 w' B5 rdeficiency. Those diagnoses were excluded by find-
/ S: P9 J, x! g2 K6 ving the normal level of adrenal steroids.: j$ n3 q& Q( A, n+ v+ h
The diagnosis of exogenous androgens was strongly
, J+ e0 b0 H9 W, u9 q5 _suspected in a follow-up visit after 4 months because
. R d6 m: j* I8 Q. I8 tthe physical examination revealed the complete disap-
& R: U/ u/ ^, @% r, d' lpearance of pubic hair, normal growth velocity, and# `9 F5 u& f1 `8 J( J
decreased erections. The father admitted using a testos-
, [7 E) x: C, c% X$ v6 i& Uterone gel, which he concealed at first visit. He was% x& K! s# @: \( ]+ a4 h; g
using it rather frequently, twice a day. The Physicians’+ Y# t2 H' P7 k- ?1 q" k# f
Desk Reference, or package insert of this product, gel or
& J) _2 b9 k2 m7 Q, h8 |" m* Zcream, cautions about dermal testosterone transfer to$ \4 }9 X5 \- L o
unprotected females through direct skin exposure.
: X+ ]; _9 ]1 dSerum testosterone level was found to be 2 times the
) c* A8 [- |! Y5 k/ c* ]baseline value in those females who were exposed to
" P- W$ i. a# ^# A5 E! neven 15 minutes of direct skin contact with their male: Z2 N4 p9 r; \& j$ X
partners.6 However, when a shirt covered the applica-) z0 q( k$ q9 y6 d
tion site, this testosterone transfer was prevented.
2 k7 A' |6 y' t7 r; KOur patient’s testosterone level was 60 ng/mL,- x4 w* Y6 E) o6 I8 B* J
which was clearly high. Some studies suggest that
1 r- |, ~8 ^: {6 \% tdermal conversion of testosterone to dihydrotestos-' u$ T0 B/ P) [/ ^5 k
terone, which is a more potent metabolite, is more
# Z* s x9 `& ^+ l+ _: q, y6 Eactive in young children exposed to testosterone
/ k* H3 A0 V h3 t5 H$ n6 ~exogenously7; however, we did not measure a dihy-0 }( V- j1 G0 v. N
drotestosterone level in our patient. In addition to. R# [ I+ X0 f$ M# `+ D
virilization, exposure to exogenous testosterone in. l! S# k. U( H4 \: m: p
children results in an increase in growth velocity and. V% f" C D' a4 z
advanced bone age, as seen in our patient.2 b# t, J w1 _. D5 i7 A2 X
The long-term effect of androgen exposure during3 u7 H) q; f" k# q
early childhood on pubertal development and final
2 C0 Q- X) l- T- M9 B* n$ xadult height are not fully known and always remain$ T6 _7 k5 [# n- W& E
a concern. Children treated with short-term testos-
# o' _0 i% V/ _1 Q7 Jterone injection or topical androgen may exhibit some
- w; v; H _1 q3 U, C$ }3 C* |acceleration of the skeletal maturation; however, after
5 _& r1 ]; I) e- D) wcessation of treatment, the rate of bone maturation' f1 o) `, `* x# I" I [4 e
decelerates and gradually returns to normal.8,9
( }3 U0 [/ [) _) P/ XThere are conflicting reports and controversy- L3 k j+ u0 t% P3 T; b
over the effect of early androgen exposure on adult" A; @$ d' k5 x* d( H- ^
penile length.10,11 Some reports suggest subnormal7 l9 {0 R& Z: t6 X$ \& O
adult penile length, apparently because of downreg-& H ]# C2 v* ^ v9 M8 S
ulation of androgen receptor number.10,12 However,
4 A& |' s2 ]) [! mSutherland et al13 did not find a correlation between& d- M! }( a- o
childhood testosterone exposure and reduced adult
7 r0 G6 Q1 f* |, L# rpenile length in clinical studies., h( a( A9 b6 M
Nonetheless, we do not believe our patient is
# J3 S+ g2 J1 f& p2 x& lgoing to experience any of the untoward effects from8 o+ q* y6 x" F; H4 e4 L
testosterone exposure as mentioned earlier because7 `% R9 m% Q- U% y% I. f0 k s1 [
the exposure was not for a prolonged period of time.0 |5 b9 W+ q: l" z# B
Although the bone age was advanced at the time of/ }5 r" p1 g* o) g7 \7 }
diagnosis, the child had a normal growth velocity at. ^2 U3 F0 |) W! |2 @! a
the follow-up visit. It is hoped that his final adult; \, e# J9 r9 d9 d' @3 C9 @5 a) [
height will not be affected.( F _9 Y- l# G/ L: F# R5 \6 h
Although rarely reported, the widespread avail-4 i$ A2 Z8 P! \, D0 Z
ability of androgen products in our society may
3 N$ @+ Z3 f/ c4 r; o2 ]indeed cause more virilization in male or female2 P: i! ^/ E2 z: ~; E& l, e. {
children than one would realize. Exposure to andro-
, w4 t% F5 y8 Y+ j( y8 f8 sgen products must be considered and specific ques-
y- D( B$ t2 d2 y. k3 Ntioning about the use of a testosterone product or
( w6 c% L( ~' R9 Bgel should be asked of the family members during9 v) X, \# E$ d& |
the evaluation of any children who present with vir-0 t9 b) J* g2 v; o. R" t' j
ilization or peripheral precocious puberty. The diag-7 J) W. g9 }8 G5 }& ^+ Z' q
nosis can be established by just a few tests and by
9 D5 n- k3 [: @7 E7 qappropriate history. The inability to obtain such a# c K" h o5 I! T$ \7 f
history, or failure to ask the specific questions, may2 y5 M ]! e6 c. J) E! \
result in extensive, unnecessary, and expensive
! L$ @& h: T/ A. pinvestigation. The primary care physician should be- K9 s6 }8 `5 D" I# t
aware of this fact, because most of these children' m+ G5 M; r6 g% E3 F
may initially present in their practice. The Physicians’
( s3 J& r, A8 Z( y' {Desk Reference and package insert should also put a
( V k) E8 n& Kwarning about the virilizing effect on a male or
R% C3 r8 F: H" E- g3 Q6 |, vfemale child who might come in contact with some-6 v& e6 x% a+ W% u, p
one using any of these products.8 W, h9 T; s9 b' S
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! }/ n% ?! O9 [2 Pdevelopment in a two-year-old boy induced by topical
, A1 [2 @" S Y$ texposure to testosterone. Pediatrics. 1999;104:e23.
; R4 o3 `( `6 |3 n4 [% @5. Greulich WW, Pyle SI, eds. Radiographic Atlas of
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5 V/ D8 Z, S# G6 _, J. ^6. Physicians’ Desk Reference. Androgel 1% testosterone,
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! z/ x# B( ?% x, B% h' aEconomics Company, Inc; 2004:3239-3241.
; x4 e% r% G9 `, i$ ]5 S7. Klugo RC, Cerny JC. Response of micropenis to topical
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