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is a significant concern for physicians. Central
! i- r& f1 r3 U' X: w% s. T8 Fprecocious puberty (CPP), which is mediated
. r9 p+ K; s, m: Vthrough the hypothalamic pituitary gonadal axis, has
N0 s/ Q4 z; [( ?, u+ Ya higher incidence of organic central nervous system
& I$ [: `4 R7 z1 i! Dlesions in boys.1,2 Virilization in boys, as manifested: q8 |& w0 E4 g
by enlargement of the penis, development of pubic
1 }+ d8 ^* T6 q: shair, and facial acne without enlargement of testi-
0 n' |5 e1 l. f9 J9 Kcles, suggests peripheral or pseudopuberty.1-3 We s8 ^8 z( T/ I7 U" y- Y m2 K8 U
report a 16-month-old boy who presented with the9 {' S/ _. A# b6 k# e4 R
enlargement of the phallus and pubic hair develop-4 r1 K- f* f! U; h8 ?
ment without testicular enlargement, which was due7 d5 b) M- L: F. @% ~# Y
to the unintentional exposure to androgen gel used by% o7 l6 _ U7 I1 {- Q0 r
the father. The family initially concealed this infor-
" {! H# b2 n9 A; N8 P; \mation, resulting in an extensive work-up for this) r9 R: @0 Q1 o9 P, L. ^- M
child. Given the widespread and easy availability of
8 `. R2 g& a: P, Ytestosterone gel and cream, we believe this is proba-9 B- d/ {6 y+ s: q7 O
bly more common than the rare case report in the. W+ w* S6 K, J; L( G2 ]( D/ [
literature.4( j6 ]: a, `% T0 P& s
Patient Report7 {+ w! t! N/ ?4 x, N
A 16-month-old white child was referred to the( ^. f/ K# _: V; P7 _/ s2 x" d
endocrine clinic by his pediatrician with the concern8 ?- T* z( O2 c( C& O
of early sexual development. His mother noticed4 E% t8 J f8 }4 z
light colored pubic hair development when he was
6 x& }1 _' [; ?From the 1Division of Pediatric Endocrinology, 2University of
9 r6 X& k3 H1 A3 qSouth Alabama Medical Center, Mobile, Alabama.
4 P6 P1 p! D" w7 B- Z- bAddress correspondence to: Samar K. Bhowmick, MD, FACE,7 `/ w5 {5 [1 m6 P; l; n
Professor of Pediatrics, University of South Alabama, College of r k3 Z2 T/ ~% P# d/ |2 {# J- U
Medicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;
# K! t* J- ~, }/ D' xe-mail: [email protected].. j2 g7 u S, z
about 6 to 7 months old, which progressively became1 Z }3 ~( k& Y. C% [5 C0 Q6 B$ e
darker. She was also concerned about the enlarge-2 K0 U. Z, p6 T4 d& n! I9 o3 L8 ~
ment of his penis and frequent erections. The child
$ L. L! B$ H2 W+ } G$ h; b0 d4 R- Fwas the product of a full-term normal delivery, with
3 A% Z2 g" w- \8 x S' S5 Za birth weight of 7 lb 14 oz, and birth length of
; C0 N$ R3 Q0 p20 inches. He was breast-fed throughout the first year
2 n& G" W+ x6 eof life and was still receiving breast milk along with
9 r1 _# S6 x! M- msolid food. He had no hospitalizations or surgery,
) d$ n0 H% E" J" e1 j& Kand his psychosocial and psychomotor development
1 N- D" ~8 ~5 `" x8 Uwas age appropriate.9 I. D# }- U: M1 H/ K5 t
The family history was remarkable for the father,
0 o+ h6 k; A1 f' j$ Gwho was diagnosed with hypothyroidism at age 16,
8 L5 Z/ Y5 Y9 Twhich was treated with thyroxine. The father’s
' h9 `# w- ^% vheight was 6 feet, and he went through a somewhat
6 f ^2 B! i& P2 q2 Y! \/ f& j+ Iearly puberty and had stopped growing by age 14. B& l/ ~8 W: [* e% A
The father denied taking any other medication. The) r2 D% J2 r- d, w; f
child’s mother was in good health. Her menarche2 @- T+ w" j5 z* n. u
was at 11 years of age, and her height was at 5 feet4 ^2 l, |6 m$ T2 ^
5 inches. There was no other family history of pre-$ I% m8 d, r% R* a
cocious sexual development in the first-degree rela-
5 V+ m, ^7 J# m5 R) Utives. There were no siblings./ _2 P9 _) _2 C3 |
Physical Examination% w1 d8 @5 \% V" M# v9 P/ ^
The physical examination revealed a very active,; m# A& \1 F/ S5 C& U
playful, and healthy boy. The vital signs documented$ w6 h+ m0 m3 g
a blood pressure of 85/50 mm Hg, his length was
5 C1 q6 J( C5 D- }1 U( y90 cm (>97th percentile), and his weight was 14.4 kg$ B9 L# \- \( [ s$ P7 s# @
(also >97th percentile). The observed yearly growth# ^- F4 l% p7 o, u" q
velocity was 30 cm (12 inches). The examination of
& [; m( @1 e) ^ y! [/ x# Tthe neck revealed no thyroid enlargement.
) W3 j" ^! P- {; Q, R; s0 E/ oThe genitourinary examination was remarkable for$ X. X) ] q- T: h! y, C4 c8 K4 o
enlargement of the penis, with a stretched length of
5 F# J) ]% J# k# U8 cm and a width of 2 cm. The glans penis was very well
' D7 G8 b& r0 ?. B" }2 Fdeveloped. The pubic hair was Tanner II, mostly around
# j. B4 g" ~- n# J$ i5 z7 o540/ V+ t0 S! v2 S
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
* {- U. f! E: D2 ]* i# l4 D) k9 {the base of the phallus and was dark and curled. The$ }- `' s& l. Y9 ?& L- \
testicular volume was prepubertal at 2 mL each.
5 V* s& p& V; n$ u* c/ RThe skin was moist and smooth and somewhat
8 A5 n9 [9 j. ~! D2 w, Yoily. No axillary hair was noted. There were no+ M( ^0 n4 q. g+ l/ i7 l1 O
abnormal skin pigmentations or café-au-lait spots.! s/ M" u$ Q0 A5 Y. S( G
Neurologic evaluation showed deep tendon reflex 2+" |# @% u' Y7 {) {- ~
bilateral and symmetrical. There was no suggestion$ G$ s( w# t. ~' @
of papilledema.
$ N' v% t! A( d3 P7 BLaboratory Evaluation: b& a. a4 d/ h$ A2 q+ b/ h
The bone age was consistent with 28 months by
/ g0 \" I; }& k1 v( v4 Ousing the standard of Greulich and Pyle at a chrono-
( E9 [% z5 k5 r+ p# Y/ p$ y' ?logic age of 16 months (advanced).5 Chromosomal
7 E- F; B2 ?, `+ Okaryotype was 46XY. The thyroid function test6 V& p8 x( C& G! C2 u0 ]
showed a free T4 of 1.69 ng/dL, and thyroid stimu-
" s# ~! e) z: v8 j/ y4 ?lating hormone level was 1.3 µIU/mL (both normal).
! t, A# I1 F$ _2 l! o) hThe concentrations of serum electrolytes, blood
3 z1 z7 X. ]- ]0 L: i2 H4 e, ~urea nitrogen, creatinine, and calcium all were
" f) Y# y# T9 L8 E5 {/ ^within normal range for his age. The concentration
9 c- c: l5 T: `, r+ @7 B$ ~9 Vof serum 17-hydroxyprogesterone was 16 ng/dL
; y9 e* u8 ~3 \# h7 r- z# `3 k# o(normal, 3 to 90 ng/dL), androstenedione was 20
& L5 d5 I3 L# P5 W* q* _ng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-7 _6 E B, a* l& c7 w+ C
terone was 38 ng/dL (normal, 50 to 760 ng/dL),
3 N3 G( N; ]- E+ `6 b: p" Rdesoxycorticosterone was 4.3 ng/dL (normal, 7 to+ g7 b4 ^3 x0 {0 G; Z
49ng/dL), 11-desoxycortisol (specific compound S). n r, M# y/ y4 T0 B
was 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-- {/ A V7 M# t" d+ q' Z# L t
tisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total: n3 N) I: k/ V% g( r
testosterone was 60 ng/dL (normal <3 to 10 ng/dL),
9 i! ~! ^& I; W% P% \: ~5 A; ~3 Uand β-human chorionic gonadotropin was less than# t$ g6 Z% h9 K1 M* z. {: `) ^/ S
5 mIU/mL (normal <5 mIU/mL). Serum follicular
5 L% ^' w: h8 [stimulating hormone and leuteinizing hormone" S6 l& x4 u, k# d9 s+ w
concentrations were less than 0.05 mIU/mL
b: ]/ N Y& `- \) I: F$ F(prepubertal).
T" N$ u( D. [# lThe parents were notified about the laboratory; [6 v8 y* ~* h* P5 @9 m* Y# Q
results and were informed that all of the tests were
0 @0 a: I9 S; R; T% f) Nnormal except the testosterone level was high. The- O0 ^0 f: e. C& C
follow-up visit was arranged within a few weeks to
; _" i/ O+ u: l3 q" l/ [obtain testicular and abdominal sonograms; how-* u: @# s9 H, e9 R
ever, the family did not return for 4 months.
9 S: R& U: z4 ]5 v8 XPhysical examination at this time revealed that the
- G! |. m1 y- \' q6 E8 R: \child had grown 2.5 cm in 4 months and had gained8 ~2 `3 Y# m z6 ]4 X3 P
2 kg of weight. Physical examination remained& J/ ]: v( F; u/ a) C1 }
unchanged. Surprisingly, the pubic hair almost com-& @, l( Q* F B" o' s
pletely disappeared except for a few vellous hairs at
" O3 J, r# o' e4 @/ h! A+ H' O, hthe base of the phallus. Testicular volume was still 2
3 F5 k6 H9 u8 y9 c$ V8 R5 WmL, and the size of the penis remained unchanged.# h# N/ ?+ F6 E" `
The mother also said that the boy was no longer hav-
7 \: k4 s" S" K, L6 t' }) Y- ]ing frequent erections.
& y3 z5 u6 J5 F5 d$ n9 }1 [# f! `Both parents were again questioned about use of
) } z& ]$ s) a; ?4 Z Dany ointment/creams that they may have applied to* X" n$ A Y5 N9 D; d9 M
the child’s skin. This time the father admitted the
2 J* g4 _% Q- Z2 v7 z! MTopical Testosterone Exposure / Bhowmick et al 541; J4 V' g5 l$ X' F6 S4 e/ C
use of testosterone gel twice daily that he was apply-3 b$ _' P* \ D
ing over his own shoulders, chest, and back area for. s6 H6 f7 S) u% I1 d
a year. The father also revealed he was embarrassed' v4 I. x' C/ _- N0 o
to disclose that he was using a testosterone gel pre-1 M$ B: Z+ P# x
scribed by his family physician for decreased libido! Z x& {+ {( {. j- x( K
secondary to depression.
/ i- D% D7 l$ v2 f+ hThe child slept in the same bed with parents.
* L# ^" v& T- B& D. tThe father would hug the baby and hold him on his: s" V' r0 d: ~: e5 K9 q" c- J
chest for a considerable period of time, causing sig-
( {% C- i* `- n" ~" e( Qnificant bare skin contact between baby and father.
8 e. P0 I Z* H4 x- B1 LThe father also admitted that after the phone call,
6 r4 q0 T: J) P- fwhen he learned the testosterone level in the baby- r; ^0 W4 A" J3 t! z1 T- S5 n8 M$ a+ m
was high, he then read the product information/ `/ c, l. ^. ?5 T
packet and concluded that it was most likely the rea-
3 s' k1 R: l% P, r( S/ vson for the child’s virilization. At that time, they }+ |0 k# g3 r* Y/ N' S. R7 Q7 P
decided to put the baby in a separate bed, and the
; i* w4 m" g& U8 ^2 B& Hfather was not hugging him with bare skin and had
, v- I h. `. D% _& sbeen using protective clothing. A repeat testosterone% i+ V" _& r) h+ J5 S
test was ordered, but the family did not go to the
5 a- ~/ ]# X: n8 E9 b, u1 y9 klaboratory to obtain the test.+ j ?2 X+ B1 v6 y) i! J* c) M
Discussion
3 k# }! L3 T3 I9 kPrecocious puberty in boys is defined as secondary
" ^7 n+ u' D _4 F- Rsexual development before 9 years of age.1,43 D; N" a! p/ O- K0 C
Precocious puberty is termed as central (true) when( y A# ^+ Q, e2 C
it is caused by the premature activation of hypo-( R+ T" |; g7 {) w+ ]( r
thalamic pituitary gonadal axis. CPP is more com-: N9 C: Y- v, _. F1 ^
mon in girls than in boys.1,3 Most boys with CPP- ^4 a- p: x( U" w) c
may have a central nervous system lesion that is% s& d- J# r- x. ]
responsible for the early activation of the hypothal-0 H* m# i0 d6 z% i4 E4 w
amic pituitary gonadal axis.1-3 Thus, greater empha-
6 I2 z' s: w" c# B3 J& A+ Fsis has been given to neuroradiologic imaging in5 D- {: m* m2 r5 k# n
boys with precocious puberty. In addition to viril-
# D3 o6 p/ L. o% \! cization, the clinical hallmark of CPP is the symmet-& j0 g- R/ l7 [2 ?
rical testicular growth secondary to stimulation by2 |, _: {9 a1 C# q$ W" W* F# e
gonadotropins.1,3
" k$ L. ]3 Q$ X4 T/ n @Gonadotropin-independent peripheral preco- w2 X! P; L, Z' d! I8 H l- c
cious puberty in boys also results from inappropriate0 U5 N3 g5 z, L: m4 D# H, k8 W6 ~
androgenic stimulation from either endogenous or
4 }' f8 M6 f* R3 }7 T1 yexogenous sources, nonpituitary gonadotropin stim-
" _. L* l4 M3 {% ?$ culation, and rare activating mutations.3 Virilizing
9 |$ i/ a. L7 K/ pcongenital adrenal hyperplasia producing excessive' n: d' D1 w4 j' e: H; A( j' I) B
adrenal androgens is a common cause of precocious6 Y4 [ O( ~, Z9 X& ~( y3 a: X6 @
puberty in boys.3,4
: P# z7 D, d( B- ^, bThe most common form of congenital adrenal
2 w3 E4 j/ w- Y. K+ mhyperplasia is the 21-hydroxylase enzyme deficiency.
3 d/ N L- t; ^4 t$ sThe 11-β hydroxylase deficiency may also result in
% R+ x0 D* {/ R. Kexcessive adrenal androgen production, and rarely, Z3 V6 z" l5 }3 F+ ~
an adrenal tumor may also cause adrenal androgen. i% t0 O B5 P
excess.1,3$ d- e& M( E8 r
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
& `/ V9 b" C7 X( F2 x) A: q+ U/ ~542 Clinical Pediatrics / Vol. 46, No. 6, July 20074 H$ x% | {: A# r
A unique entity of male-limited gonadotropin-
3 T2 s+ t# B$ } {3 z3 bindependent precocious puberty, which is also known9 Z! t. ~! z& R
as testotoxicosis, may cause precocious puberty at a
8 M% r9 j0 f7 G, xvery young age. The physical findings in these boys( K) t4 i n. {" W# J
with this disorder are full pubertal development,
' C' X& E# f6 o- I, a0 ]8 Pincluding bilateral testicular growth, similar to boys
9 I! p8 h; ], B5 e$ H7 j) {with CPP. The gonadotropin levels in this disorder' l- j: Q& s' g0 F4 P0 \( l) q1 k) h
are suppressed to prepubertal levels and do not show& _' J3 [9 [' s) v- w2 s
pubertal response of gonadotropin after gonadotropin-
! G0 B9 D5 E# s5 v- m) ^' s8 Wreleasing hormone stimulation. This is a sex-linked
# z- E. B- s& A( Z) }, bautosomal dominant disorder that affects only
1 O$ b# ^! A; T7 Q# @males; therefore, other male members of the family+ X6 A- {' Y; X5 {) {) E
may have similar precocious puberty.3
/ x" v3 t5 N% P J- aIn our patient, physical examination was incon-
2 k' f' B) M( e, a6 U6 Csistent with true precocious puberty since his testi-
; h8 h8 L9 A8 Y. j; h0 F0 S: ucles were prepubertal in size. However, testotoxicosis0 ?- j U) x" m
was in the differential diagnosis because his father
2 P8 h4 t* |( K3 n" {4 Zstarted puberty somewhat early, and occasionally,
! a- }% r+ q" ^* jtesticular enlargement is not that evident in the
) L6 a1 `+ R- dbeginning of this process.1 In the absence of a neg-' y6 ]3 V7 @2 Q& W2 z. P! Y
ative initial history of androgen exposure, our
6 N6 n% U0 u8 K6 \& hbiggest concern was virilizing adrenal hyperplasia,
7 Z7 n: K4 t! ]/ ]4 o; zeither 21-hydroxylase deficiency or 11-β hydroxylase1 |. I7 N) X( \) w* A' L0 V) c+ P: K' [2 }
deficiency. Those diagnoses were excluded by find-4 v' S7 y( f1 L$ j! i1 L3 p2 y
ing the normal level of adrenal steroids.
, }' H/ X ~5 G- n4 vThe diagnosis of exogenous androgens was strongly
8 R( l- B* z3 v, [4 S5 @suspected in a follow-up visit after 4 months because
. m( g2 P9 n F2 H. F; a. K {the physical examination revealed the complete disap-
$ R4 t1 H3 `% s) epearance of pubic hair, normal growth velocity, and
* P+ _. k. `( ^! G5 Ydecreased erections. The father admitted using a testos-% d& A% u* v5 `5 d9 j' R
terone gel, which he concealed at first visit. He was, J# @# h7 P5 a7 G# w
using it rather frequently, twice a day. The Physicians’
+ R$ F6 k; e4 n9 r; A: m" dDesk Reference, or package insert of this product, gel or
7 J; s3 U5 x6 Y) F% A T9 Zcream, cautions about dermal testosterone transfer to4 ]) @8 J) ^; x+ ]' e
unprotected females through direct skin exposure.
( D/ B+ U) K* W8 @2 b$ ESerum testosterone level was found to be 2 times the, L+ e- X `$ ?/ O/ N5 y$ v
baseline value in those females who were exposed to& F5 I3 B( |6 Z' x5 |
even 15 minutes of direct skin contact with their male" W) w) x+ ^5 d8 M7 y
partners.6 However, when a shirt covered the applica-
: d# g3 m! O: N6 Ttion site, this testosterone transfer was prevented.) ?4 @, U# B% P( Z7 g( p% J
Our patient’s testosterone level was 60 ng/mL,
+ l! P% J% j6 V |% M4 wwhich was clearly high. Some studies suggest that
/ O- H5 n( Z, J$ N) ldermal conversion of testosterone to dihydrotestos-
: i1 E7 Q2 K' m, k& Z& uterone, which is a more potent metabolite, is more
6 H& V/ t9 I* s2 y0 |' \active in young children exposed to testosterone. U% d0 [# S" ~9 A4 f8 H
exogenously7; however, we did not measure a dihy-
# C2 c: c1 \0 L( a7 Jdrotestosterone level in our patient. In addition to
' t2 J- C9 l/ I. o$ w. |virilization, exposure to exogenous testosterone in
& l+ T Q9 K3 M2 \! \children results in an increase in growth velocity and- u! K: g) h: g
advanced bone age, as seen in our patient.
5 s( O. `) o, s+ A5 X) [7 m$ sThe long-term effect of androgen exposure during. b& E5 A5 j: H9 Z& B1 E
early childhood on pubertal development and final
! R) C% [, z9 I" f/ Sadult height are not fully known and always remain
i8 \4 P9 F' U8 M. g; ~a concern. Children treated with short-term testos-
* H8 g7 E8 g( ~7 M8 p5 |terone injection or topical androgen may exhibit some ? p2 u% \5 n, @
acceleration of the skeletal maturation; however, after( I+ b; Z; N) T: h3 o) j% ]' l
cessation of treatment, the rate of bone maturation+ ?/ s, g) [3 j
decelerates and gradually returns to normal.8,90 D, f9 a4 l: j( |8 E# ~8 e
There are conflicting reports and controversy1 @" {5 S. M4 b- T* G" C( ^
over the effect of early androgen exposure on adult8 Z( E$ f6 F4 y" E; h# g
penile length.10,11 Some reports suggest subnormal
: O1 J x1 r- y `' v( H5 f7 k" aadult penile length, apparently because of downreg-2 {/ k5 P, { Z7 c$ o6 v$ V9 ]
ulation of androgen receptor number.10,12 However,
3 M2 {+ \8 v2 z( F; F) e! OSutherland et al13 did not find a correlation between% x8 V$ M3 T: m
childhood testosterone exposure and reduced adult
8 a7 v5 O, m6 c3 ~9 |8 rpenile length in clinical studies.# t O9 ^1 N, {; Y7 g' f3 j* H
Nonetheless, we do not believe our patient is6 ? W/ G. X! }# J: J8 H; L" x
going to experience any of the untoward effects from
' L4 u! d7 O D/ e ?testosterone exposure as mentioned earlier because
& d0 \7 s" z7 c% F8 }2 F4 D) ]the exposure was not for a prolonged period of time. g2 L& N# `. w
Although the bone age was advanced at the time of$ T! H5 \5 E; i! {, m6 r
diagnosis, the child had a normal growth velocity at3 z. J* G7 x1 Q) c2 o) l
the follow-up visit. It is hoped that his final adult
0 }5 J+ p, h2 k1 Yheight will not be affected.5 W4 K' c; T& G( ], P% _2 w
Although rarely reported, the widespread avail-
* h( T4 o4 S: Y2 Q" F7 `7 Iability of androgen products in our society may# \9 w7 s( w( d ?
indeed cause more virilization in male or female
% Y8 Z6 m9 {, u/ {$ X/ V5 ^+ @children than one would realize. Exposure to andro-
I1 |7 ?, C5 k3 u5 |" H8 i( Lgen products must be considered and specific ques-
+ [& k# x/ T" N+ s4 s/ P I5 f; m Xtioning about the use of a testosterone product or$ |9 v1 T- o( |1 i$ z1 U
gel should be asked of the family members during
3 \3 ^9 y4 N5 i) g, |the evaluation of any children who present with vir-
" L Z5 ^0 t; P. v9 Yilization or peripheral precocious puberty. The diag-
7 }/ r: O/ E- I9 L+ n* @( vnosis can be established by just a few tests and by% n0 G1 p8 r+ x, a/ L0 K
appropriate history. The inability to obtain such a
3 Z$ \ z/ E3 d5 L4 N) Khistory, or failure to ask the specific questions, may& ?+ Q8 P( R* O: A
result in extensive, unnecessary, and expensive
% R: [4 j5 Z- ^$ [- }. a+ }! t$ u3 Qinvestigation. The primary care physician should be
/ P7 A8 s+ H, t' |! Iaware of this fact, because most of these children) k- o( l5 I1 D4 U' Q. n
may initially present in their practice. The Physicians’0 k. t- H8 K" t' E
Desk Reference and package insert should also put a h$ d- s8 ?) e' y2 H
warning about the virilizing effect on a male or: K/ Y- |! u3 l
female child who might come in contact with some-
; S a; g# }" O, w. y. e/ {one using any of these products.1 f K. ]4 u3 p! [ k
References9 M5 J6 }$ Z2 B& a
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Skeletal Development of the Hand and Wrist. 2nd ed.& z& i1 X/ e& T
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6 d7 L; Z3 [+ J& L9 I- Stestosterone and gonadotropin. J Urol. 1978;119:
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