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is a significant concern for physicians. Central
1 R, {. @. G( e7 }1 Gprecocious puberty (CPP), which is mediated( K& Z1 B# O# q. {
through the hypothalamic pituitary gonadal axis, has( z6 B6 k+ N* q$ b
a higher incidence of organic central nervous system: E; s% L' h" u4 x; H+ \1 {) G
lesions in boys.1,2 Virilization in boys, as manifested
' c" q3 @) F! ]) k3 y, S0 |) Eby enlargement of the penis, development of pubic
6 `: I/ z9 }; N/ r4 Whair, and facial acne without enlargement of testi- S' A" ?% A. P6 R. I& r
cles, suggests peripheral or pseudopuberty.1-3 We7 a7 T# j" l% y# f9 `; p2 J
report a 16-month-old boy who presented with the
l H! J7 E% V6 jenlargement of the phallus and pubic hair develop-
' i% J& T. _* M7 c# Y7 p8 a8 Jment without testicular enlargement, which was due% D2 E/ ]) m/ w4 t
to the unintentional exposure to androgen gel used by
" ~$ W/ w. r) {; i4 q7 E" uthe father. The family initially concealed this infor-6 D0 B, a6 I' {" p
mation, resulting in an extensive work-up for this5 r) R. q3 ]+ t
child. Given the widespread and easy availability of
! s4 h+ ^2 G% u% @% f; Qtestosterone gel and cream, we believe this is proba-
+ x# w* _1 u" e* p7 P% V4 Mbly more common than the rare case report in the
3 T9 v6 b# V5 B- K% u: dliterature.4
8 V# Z* g0 y" o; R( m w [& @Patient Report
4 w P6 L" I' QA 16-month-old white child was referred to the7 J& H/ g% b% [& T0 q! Y
endocrine clinic by his pediatrician with the concern
* ?. }/ `% I# Vof early sexual development. His mother noticed2 `2 m% D# t7 n) a+ L
light colored pubic hair development when he was
6 B2 |3 ^+ m0 C- r0 m0 yFrom the 1Division of Pediatric Endocrinology, 2University of
' G9 L: e% A$ T+ H$ b, c1 cSouth Alabama Medical Center, Mobile, Alabama.9 Y" {/ Q0 t0 K! m7 A- F
Address correspondence to: Samar K. Bhowmick, MD, FACE,
# w/ Q. F6 q4 ?. CProfessor of Pediatrics, University of South Alabama, College of7 z2 \; A& H4 w k9 b2 |0 S* _# z2 t
Medicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;
) I$ f a6 ~ }$ Ye-mail: [email protected].
$ q% h" g; X5 I- M9 U/ U% n1 ?about 6 to 7 months old, which progressively became& g! v& M! Y! J }# q
darker. She was also concerned about the enlarge-* A3 Y' v# V/ {! o/ t
ment of his penis and frequent erections. The child
5 I+ n- | V4 g6 a( D$ E; f9 jwas the product of a full-term normal delivery, with
6 e$ U3 |- f+ J8 @a birth weight of 7 lb 14 oz, and birth length of2 S8 B8 \8 [8 G3 @2 y
20 inches. He was breast-fed throughout the first year
3 c) S K. G; y, D/ r9 p7 Q+ K6 cof life and was still receiving breast milk along with" Z3 i0 n; x& Z: ?
solid food. He had no hospitalizations or surgery,* I& D9 s4 w! E
and his psychosocial and psychomotor development
; X7 D* E+ W' R& u$ ewas age appropriate.
6 z* d+ f" r9 u% \1 HThe family history was remarkable for the father,, w1 ~( ]7 l3 W1 o
who was diagnosed with hypothyroidism at age 16,
% \& `: V4 K/ T0 X& v( P9 bwhich was treated with thyroxine. The father’s) Y1 E2 L8 o7 A- T
height was 6 feet, and he went through a somewhat
% S% n3 c0 Q7 x5 U4 hearly puberty and had stopped growing by age 14.# E$ P+ W* X1 h
The father denied taking any other medication. The
( E; q# C8 w& d* l6 ]7 Q% _1 F, M* Mchild’s mother was in good health. Her menarche4 g4 K5 E, L$ f3 @
was at 11 years of age, and her height was at 5 feet% K0 k9 X' {( V9 e
5 inches. There was no other family history of pre-9 c- w+ J6 m9 x
cocious sexual development in the first-degree rela-! ~7 k1 e3 J3 s' Z
tives. There were no siblings.9 N6 a* E% E# J0 L
Physical Examination3 v, [0 c& k( |; k
The physical examination revealed a very active,
& R7 s3 L% T# e- p1 fplayful, and healthy boy. The vital signs documented
% P( R9 W& E1 i" ?, F! Ha blood pressure of 85/50 mm Hg, his length was# p! n8 H: N6 `& }
90 cm (>97th percentile), and his weight was 14.4 kg
# c6 S6 C7 b& k: l; ~& |(also >97th percentile). The observed yearly growth v/ f7 f9 v( [, _. e
velocity was 30 cm (12 inches). The examination of
+ V8 a |7 \" g: [the neck revealed no thyroid enlargement.
& y5 H( R9 o- v% {5 ZThe genitourinary examination was remarkable for
% ?+ O0 B- t+ A r1 @6 L; {enlargement of the penis, with a stretched length of, F1 v/ Y6 q$ L$ O( l4 l/ W
8 cm and a width of 2 cm. The glans penis was very well9 q3 k: K7 s6 J6 T9 I3 P4 [1 x
developed. The pubic hair was Tanner II, mostly around& o( M. a& O B* m6 ^# h
540
& _6 D% e: G* y5 `' h; T g5 v# sat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
; Z7 f( _" G& Y$ _the base of the phallus and was dark and curled. The
' G# j6 ~) @( Otesticular volume was prepubertal at 2 mL each.
% d" Z' o$ f8 e& r9 U' Q( B6 n8 }1 eThe skin was moist and smooth and somewhat
7 a6 r0 _/ c; z7 B% F9 Q0 h+ Coily. No axillary hair was noted. There were no
8 L* u- U1 W2 W8 O9 Gabnormal skin pigmentations or café-au-lait spots.
* n9 Q0 B! E6 v# V/ }* [ ]; H1 @, A; wNeurologic evaluation showed deep tendon reflex 2+
& o: l* o7 Q* g3 Vbilateral and symmetrical. There was no suggestion4 v* ^0 G4 Z* d9 b1 D% l% D7 U, S8 T2 D
of papilledema.
; }1 J! w; W, s# k# \Laboratory Evaluation' i0 `9 \3 P+ N7 E0 _1 n; a( W; y
The bone age was consistent with 28 months by
" k3 k' Y7 U9 g; O Yusing the standard of Greulich and Pyle at a chrono-
5 a" T$ l5 r& V, Vlogic age of 16 months (advanced).5 Chromosomal
* v- s. e5 r$ s+ Okaryotype was 46XY. The thyroid function test9 d) F# U% O# X! w* R+ s+ a9 I* U0 Z
showed a free T4 of 1.69 ng/dL, and thyroid stimu-/ ?6 i0 \; k7 E6 ^
lating hormone level was 1.3 µIU/mL (both normal).
# ?0 W, e$ R. ~The concentrations of serum electrolytes, blood% y- P. ]) u* q
urea nitrogen, creatinine, and calcium all were
. M& e9 s. |. z" \+ k6 Qwithin normal range for his age. The concentration# T; P. M5 Y" W( p- K, u4 V' m; U
of serum 17-hydroxyprogesterone was 16 ng/dL) R2 w* [0 O9 R9 w1 D
(normal, 3 to 90 ng/dL), androstenedione was 20
# J" ?5 i# s% Q3 n* b3 w; g- b8 Vng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-
' K- n Z/ W# ~ Yterone was 38 ng/dL (normal, 50 to 760 ng/dL),
. z2 [; a1 T& @- K. N4 n& @+ Kdesoxycorticosterone was 4.3 ng/dL (normal, 7 to% E6 V9 s8 d. @. h% u
49ng/dL), 11-desoxycortisol (specific compound S)2 ~% ^! ]& ~/ |0 w
was 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-
( n* K. ~" A: F4 P9 r! z6 R3 d" \tisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total
* E! H1 @1 @7 }. Atestosterone was 60 ng/dL (normal <3 to 10 ng/dL),9 I2 ^% O/ B& e B8 W. [' [
and β-human chorionic gonadotropin was less than
% e7 |) o7 F" E& b: {# m2 R+ M5 mIU/mL (normal <5 mIU/mL). Serum follicular: X8 e- F' S) k/ R
stimulating hormone and leuteinizing hormone
% V8 U5 M7 G% econcentrations were less than 0.05 mIU/mL W. x9 f+ S9 h
(prepubertal).+ Y0 L, ?, T, q' J
The parents were notified about the laboratory
/ n* o7 y3 \( i& cresults and were informed that all of the tests were" ]" F# |( C; C2 A$ `
normal except the testosterone level was high. The4 K) I0 E% o& L8 Q5 ^$ Y/ \7 ?
follow-up visit was arranged within a few weeks to/ ^& E; q* X% s: D6 M
obtain testicular and abdominal sonograms; how-
! r8 S' N+ P) a0 H3 i) }3 gever, the family did not return for 4 months.
3 ]9 T- r) [! OPhysical examination at this time revealed that the
* L% e% [. b8 P3 N# v; xchild had grown 2.5 cm in 4 months and had gained; K$ e9 J- r0 j5 b, ?
2 kg of weight. Physical examination remained1 k3 t ?% Q) N; N* F
unchanged. Surprisingly, the pubic hair almost com-
# k+ X( _5 U2 M, T* u: t- H0 a+ jpletely disappeared except for a few vellous hairs at
' U1 @! D2 W! S R9 V; Qthe base of the phallus. Testicular volume was still 2; b, y; f+ v# X* g% U* D6 \
mL, and the size of the penis remained unchanged." N# C" d+ }/ U
The mother also said that the boy was no longer hav-. @4 L4 [1 }) f# D1 d
ing frequent erections./ G2 ^$ R' n6 v
Both parents were again questioned about use of
4 s) r4 ?; t# jany ointment/creams that they may have applied to0 C! k3 p. |. R8 u' ?0 ^- m
the child’s skin. This time the father admitted the
C' Y/ l! g+ g! x4 z% k: Q8 \Topical Testosterone Exposure / Bhowmick et al 541
1 ]! y5 _8 V" S. D# o4 g/ ~1 ouse of testosterone gel twice daily that he was apply-
3 @! [1 r- I1 k) t6 fing over his own shoulders, chest, and back area for8 X9 L5 J. [/ F- w6 a) w, ?
a year. The father also revealed he was embarrassed
2 j' J7 O' a$ p( j8 ]to disclose that he was using a testosterone gel pre-
6 Q: u5 H: Z8 L- Iscribed by his family physician for decreased libido! d- Y/ i5 Y8 U2 [+ k" A" I+ G# f+ J
secondary to depression.
' s3 k! c* w! b; u& a1 JThe child slept in the same bed with parents.
! T$ g; [& N$ [4 cThe father would hug the baby and hold him on his7 s z9 ?" A+ Y5 @
chest for a considerable period of time, causing sig-6 f+ n3 F7 ?( p* u2 w0 W
nificant bare skin contact between baby and father.1 h! M( T* `" d4 X& m
The father also admitted that after the phone call,9 @+ j3 o! o: O6 u4 e0 K
when he learned the testosterone level in the baby/ Z) I7 s8 l0 k
was high, he then read the product information ~0 ?6 l$ W3 L: }8 {; K$ n, L
packet and concluded that it was most likely the rea-" `6 U3 g# H2 `0 u8 x( J# X$ m. e
son for the child’s virilization. At that time, they
7 U& B: O/ N; c edecided to put the baby in a separate bed, and the/ J! }7 j: I) @: X9 `+ Q; H
father was not hugging him with bare skin and had
6 A$ O B5 j" x" g2 t% ^been using protective clothing. A repeat testosterone- ]8 }& E' C5 h
test was ordered, but the family did not go to the9 h, H. \+ z0 ~6 E0 r0 E! K
laboratory to obtain the test.* v# J" W4 Z" n+ {" Y, X K" o
Discussion( Z* ], _( k) T1 e: o; k" V1 `5 i
Precocious puberty in boys is defined as secondary, Q. l* W+ B# D/ W$ a
sexual development before 9 years of age.1,4
' B# P; C4 e( }4 ?. P; C; ]4 }- KPrecocious puberty is termed as central (true) when
7 u- g& B' N0 yit is caused by the premature activation of hypo-
: H S! m+ t8 P8 n: M) }thalamic pituitary gonadal axis. CPP is more com-) ~+ H& A: _% P/ ^' y3 W
mon in girls than in boys.1,3 Most boys with CPP0 ?! C. u' N; v% B- U$ n7 \% e
may have a central nervous system lesion that is8 s1 p7 g1 u/ M6 p: @+ U% c$ D
responsible for the early activation of the hypothal-
; P( R; l- j5 Y* ~, d$ L1 e% m0 famic pituitary gonadal axis.1-3 Thus, greater empha-
/ F- ]2 s7 w7 H: E4 _ i. vsis has been given to neuroradiologic imaging in
/ n: x# x: W4 F! I1 e% kboys with precocious puberty. In addition to viril-8 u7 a- I, k$ |& b! s$ E! g6 c. ]
ization, the clinical hallmark of CPP is the symmet-' y$ l3 O/ W) r+ Q- a
rical testicular growth secondary to stimulation by
: K8 n2 W) y; ?+ i+ [7 kgonadotropins.1,3
: V8 t1 F1 r% O' y2 mGonadotropin-independent peripheral preco-
( T: Q% a# L" A7 @5 ccious puberty in boys also results from inappropriate
/ O+ @* H5 G& @8 i: a/ X" ^) b; Yandrogenic stimulation from either endogenous or
. u2 m# J1 R: } u& w7 yexogenous sources, nonpituitary gonadotropin stim-
" ?; y% f) G7 J4 mulation, and rare activating mutations.3 Virilizing, ?/ Y7 p2 M$ Z9 e
congenital adrenal hyperplasia producing excessive
) r& @. Q+ Z1 c* H' b" H" b- nadrenal androgens is a common cause of precocious5 K$ ^* W# ~$ t- {0 v9 Z
puberty in boys.3,4
; P& T5 B+ x- u5 `% bThe most common form of congenital adrenal
% U$ k! z; ^/ P8 [hyperplasia is the 21-hydroxylase enzyme deficiency.
% t& y, }, B) {5 v4 XThe 11-β hydroxylase deficiency may also result in3 `+ K. ?. v6 \7 c
excessive adrenal androgen production, and rarely,
' G2 V* e6 R7 b- t) tan adrenal tumor may also cause adrenal androgen: P! m2 k) Q7 O. B- d- H$ r
excess.1,3: x% t; X$ m" P& z
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
9 y0 x1 j3 p7 [/ t0 }1 _8 `542 Clinical Pediatrics / Vol. 46, No. 6, July 2007
, j0 g7 {8 v2 i7 x* S3 [A unique entity of male-limited gonadotropin-" C( v* ^3 l: C9 N& z' r
independent precocious puberty, which is also known
9 K1 Z s' L) I8 b4 c3 Bas testotoxicosis, may cause precocious puberty at a) U# Z6 L% ]; l" j3 E- w
very young age. The physical findings in these boys% w4 V! D6 m4 `. ]1 u2 {
with this disorder are full pubertal development,! ~1 x: u. U r F u3 d: H2 O* ]& v: ^
including bilateral testicular growth, similar to boys
% A5 H& Z$ B" d1 m) D) r! X! zwith CPP. The gonadotropin levels in this disorder$ H) ]7 W" v+ {2 O; X$ I
are suppressed to prepubertal levels and do not show; c# @: K% m& M3 ]; C% L: R _ P
pubertal response of gonadotropin after gonadotropin-
" Q' C! }/ p% [8 G, Kreleasing hormone stimulation. This is a sex-linked
$ ?& O2 \; Q( _( [" T5 m; b3 p: mautosomal dominant disorder that affects only
7 ~( q# H8 M" hmales; therefore, other male members of the family9 [2 I" G ]& O% i: {" t. G6 B
may have similar precocious puberty.3
4 e0 G3 z# O( `' b( Z1 NIn our patient, physical examination was incon-
- t( h- X) T" V2 \$ R# q# esistent with true precocious puberty since his testi-' @4 S6 n$ J9 W- L: o r
cles were prepubertal in size. However, testotoxicosis
- ?1 o5 d% `$ t! h( xwas in the differential diagnosis because his father& @% f( k" m' R' W8 r7 \+ z" ~& @. t
started puberty somewhat early, and occasionally,
]$ I h, S6 K: X" e) |testicular enlargement is not that evident in the0 s* {: q! c7 i+ j4 `- Q
beginning of this process.1 In the absence of a neg-
: x7 u. A" ]7 r( O) _/ Hative initial history of androgen exposure, our
- L1 x' U* T; l2 r3 qbiggest concern was virilizing adrenal hyperplasia,
. z) k3 a1 v) q; N) S+ L" Keither 21-hydroxylase deficiency or 11-β hydroxylase. q& I# o8 E* a$ O% q+ }
deficiency. Those diagnoses were excluded by find-
" @. U0 [; U/ g6 G% |. G. bing the normal level of adrenal steroids.& r K$ x; ?" F8 n( g5 c: J
The diagnosis of exogenous androgens was strongly
4 q e% t4 K; x- fsuspected in a follow-up visit after 4 months because
. W+ B& w" @8 O: N) N# [0 kthe physical examination revealed the complete disap-% F4 q, @. h) B6 Y! R3 U
pearance of pubic hair, normal growth velocity, and: D5 ]! M: q5 a+ Q& e+ l
decreased erections. The father admitted using a testos-
4 r z+ M# [0 Kterone gel, which he concealed at first visit. He was6 H' A; |) L' W: b- a, K% }
using it rather frequently, twice a day. The Physicians’6 \' h4 r( c, l0 q) E( _
Desk Reference, or package insert of this product, gel or
$ m# w5 W% B' R3 @1 H" pcream, cautions about dermal testosterone transfer to
+ K! {2 e, O6 punprotected females through direct skin exposure.7 \0 p0 ?& }* M8 H/ O
Serum testosterone level was found to be 2 times the
1 v6 D7 g# P0 j& `3 n( S7 Dbaseline value in those females who were exposed to+ Z! G, _# [4 E& _
even 15 minutes of direct skin contact with their male
9 Z6 [ |3 E; l7 \partners.6 However, when a shirt covered the applica-
2 k5 C" ^' R% `; y# Y7 `7 u" i7 ]tion site, this testosterone transfer was prevented.
* h8 _2 M5 A. T4 S8 s) h {Our patient’s testosterone level was 60 ng/mL,
6 a& a# {8 x9 {+ I) l7 c7 f! v/ e8 Jwhich was clearly high. Some studies suggest that
* q1 h$ r/ H" l5 a% r% f$ Y$ p1 J7 Ddermal conversion of testosterone to dihydrotestos-' s$ `' F( M+ A) \+ F
terone, which is a more potent metabolite, is more
! m) e& z7 G. L. p0 f: ?% Zactive in young children exposed to testosterone
' j. d d$ o, n: I4 A/ I4 s$ }9 kexogenously7; however, we did not measure a dihy-
9 }5 I6 _; ~5 { s: Q! f( B5 kdrotestosterone level in our patient. In addition to% K# Q' r3 f1 P
virilization, exposure to exogenous testosterone in: _% l7 i1 D& _& G) o" B
children results in an increase in growth velocity and- R! M! i# B% L4 c( h- {
advanced bone age, as seen in our patient.3 h$ q9 T& x9 ~% i+ O8 b0 a! C
The long-term effect of androgen exposure during
; ~% ], f0 y* b# d) t Nearly childhood on pubertal development and final
5 c) a( G- {$ Y$ N7 Z* d( Qadult height are not fully known and always remain
, y& q Q/ a$ o pa concern. Children treated with short-term testos-
/ U4 t8 L y5 M ` zterone injection or topical androgen may exhibit some
1 l2 M, I5 V& Y6 N# \4 C' m Jacceleration of the skeletal maturation; however, after
' }% b5 a0 l& ~* rcessation of treatment, the rate of bone maturation4 d4 @: i/ q1 |1 k) i) S
decelerates and gradually returns to normal.8,9
* }$ n, `: _, y& i- b) |There are conflicting reports and controversy
9 I& p; a, K U% o2 L. b$ m$ tover the effect of early androgen exposure on adult9 E2 N% e0 ~ F
penile length.10,11 Some reports suggest subnormal
K$ P6 b4 ~3 o" }5 q( n8 [8 Padult penile length, apparently because of downreg-) u2 k4 y: h$ M4 m9 E* o
ulation of androgen receptor number.10,12 However, s5 }7 S* l. p/ a
Sutherland et al13 did not find a correlation between8 A% Q: x5 `6 l- j
childhood testosterone exposure and reduced adult
" v8 U+ A+ x& E" K9 e3 Npenile length in clinical studies.
* H. z* F* n+ pNonetheless, we do not believe our patient is3 f) G: l* T1 K+ O; B! W; Q& q
going to experience any of the untoward effects from1 D4 x: A- u+ K X1 [$ a7 I V
testosterone exposure as mentioned earlier because S8 @9 `% l6 u1 x8 H$ p+ I+ X
the exposure was not for a prolonged period of time.
7 N) R8 b7 B4 N) gAlthough the bone age was advanced at the time of
8 S, Z4 U0 A: T* _7 qdiagnosis, the child had a normal growth velocity at/ T' y: Q" x6 |- x6 N5 s3 j
the follow-up visit. It is hoped that his final adult' T" s+ @: r9 c& N R2 l
height will not be affected.
% Y4 Q( H8 K0 FAlthough rarely reported, the widespread avail-2 @9 l6 {+ }9 v" o% S, N$ }
ability of androgen products in our society may% ?2 @! e4 {4 \1 g1 T$ @; U
indeed cause more virilization in male or female
# |1 U/ k& r( n3 }) }* F! Schildren than one would realize. Exposure to andro-
4 W2 B9 e- X$ _0 A: d* u: tgen products must be considered and specific ques-4 Y' ]! r# K. _3 M* N
tioning about the use of a testosterone product or
' I: w8 T6 T' n" rgel should be asked of the family members during$ E& c/ P) \! f! u8 a( p
the evaluation of any children who present with vir-# I9 a- L3 S& A$ F# N X g) {. W
ilization or peripheral precocious puberty. The diag-
0 E; M6 t: ~7 j1 n" pnosis can be established by just a few tests and by
! u: {5 a. C; ?appropriate history. The inability to obtain such a
1 m ^7 Y+ O+ |: F9 n* Uhistory, or failure to ask the specific questions, may
# n5 Z; x) W o/ n5 N9 Yresult in extensive, unnecessary, and expensive
' m* Y3 s1 x, }' sinvestigation. The primary care physician should be
; M6 a7 h4 u; B. M5 q. ?aware of this fact, because most of these children: T! O- q' @ Y7 [ T& {
may initially present in their practice. The Physicians’
( L4 `7 \7 y- Q+ C# J7 \Desk Reference and package insert should also put a/ Z; G: X$ u4 r
warning about the virilizing effect on a male or4 K) p G# d9 K4 K* |* a& }
female child who might come in contact with some-
* ]- d( o0 Q% q! I3 g2 ione using any of these products.
# F6 J- }. U% |5 l9 EReferences
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